The self-locking principle of the nut relies on the friction force generated between the nut and the bolt. However, this self-locking capability may become less reliable under dynamic loads. In order to ensure that the nut can be firmly locked in an emergency, anti-loosening measures must be taken. Lock nuts are an effective solution for preventing nuts from loosening. The anti-loosening effect of the lock nut mainly depends on the interaction force between the nut and the bolt thread. Various methods can be employed to enhance this interaction force. Structural modifications to the nut threads, such as adding serrations or flanges, increase friction. Another method is to roughen the surface of the nylon lock nut to produce a higher coefficient of friction. Additionally, surface treatments on the threads, such as coatings or platings, can enhance the interaction between the nut and bolt threads and increase resistance to loosening. By implementing these measures, the reliability and stability of nut locking are guaranteed even under dynamic loads.
